Electrical laboratory apparatus.



O. H. THORDARSON.

ELECTRICAL LABORATORY APPARATUS.

APPLICATION FILED APR.17, 1905.

Patented Sept. 15, 1908.

2 SHEETS-SHEET 1.

e. H. THORDARSON.

ELECTRICAL LABORATORY APPARATUS.

APPLIGATION I'll JED APR. 17, 1905.

Patented Sept. 15, 1908.

2 SHEETS-SHEET 2.

CHESTER II. 'lIIORDAItSON, OF CHICAGO, ILLINOIS.

ELECTRICAL LABORATORY APPARATUS.

Specification of Letters Patent.

Patented Sept. 15, 1908.

Application filed April 17,1905. Serial No. 255,893.

T all whom it may concern:

Be it known that I, Cnnsrnn H. Tnon- DARSON, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Electrical Laboratory Apparatus, of which the following is a specification.

This invention relates to electrical laboratory apparatus.

vide an apparatus of the character referred to comprising separate independent parts, which may be readily and quickly assembled F Without employing securing connections and without requiring tools or appliances to effect assembling or dismemberment thereof, the various arts being merely placed loosely and freely t e one upon the other in proper relation for any desired experiment or demonstration.

Other objects of the invention will appear more fully hereinafter.

The invention consists substantially in the construction, combination, location and arrangement of parts, all as will be more fully hereinafter set forth, as shown in the accompanying drawings, and finally pointed out m the appended claims.

Referring to the accompanying drawings, and to the various views and reference-signs appearing thereon,-Figure 1 is a View in side elevation of an apparatus embodying the principles of my invention, showing one arrangement thereof, parts being in section and parts broken out. Fig. 2 is a view in transverse section on the line 22 of Fig. 1, showing the laminated cores employed and in slightly separated relation. Fig. 3 is a view in transverse section through a magnet coil on the line 33 of Fig. 1, looking in the direction of the arrows. Fig. 4 is a view similar to Fig. 1, showing the parts asse1nbled for operating a rotary transformer. Fig. 5 is a view in vertical section of a base part and a superimposed magnet coil and core, embodying the principles of my invention.

The same part is designated by the same reference-sign wherever it occurs throughout the several views.

In essential characteristics my invention consists generally of a laminated magnetic base, laminated magnetic cores and a laminated magnetic cross-piece, these various parts being entirely independent of each other and capable of being assembled in any suitable or desirable arrangement, according to the required experiment or test.

The magnetic. base comprises the side plates A B and end portions C D, forming a trough or casing in which are assembled the iron laminations or plates E flatwise upon each other and placed in edgewise relation within the box or casing, thus forming a magnetic base frame. This frame may be supported upon suitable insulating studs or legs F, or otherwise, as may oe desired. The

' magnet cores comprise iron plates or laminations G, placed 'l'latwise upon each other and suitably clamped or bolted together between clamp plates II by bolts J. Similarly, the magnetic cross-bar is composed of iron plates or laminations K, placed i'latwise upon each other and suitably clamped flatwise 'against each other between clamp plates L.

In assembling these parts for laboratory demonstrations, experiments, tests, or the like, one or more of the cores are placed so as to rest endwise upon the magnetic base. For instance, in Fig. 5 I have shown only one core employed, while in Figs. 1 and 4 I have shown two cores placed endwise and resting upon the magnetic base. hen the magnetic crosspicce is employed it is placed so as to rest at the ends thereof upon the magnetic cores, as shown in Fig. 1.

' It'will be observed that the iron plates forming the magnetic cores and the magnetic base and cross-piece, when these parts are assembled, rest upon and make surface contact with each other. In practice, the magnetic cores are surrounded by current conductors. These may be arranged in many different ways. For instance, and as shown, I employ a cylinder M of insulating material of sufficient diameter to slip readily over the magnetic core, and upon this cylinder I apply a winding N, the convolutions of which are arranged transverse to the length of the plates or laminations composing the core. Any desired number of layers of the winding may be employed, according to the character of the test, experiment or demon-.

demonstrations, tests and the like, additional coils or windings P Q may be employed in the form of rings designed to be inclosed within insulating coverings, indicated at R, may be slipped over the coils N, (see Figs. 1 and 3) and in addition, if desired, auxiliary windings S may be applied exteriorly to the coils P Q. Where two or more of the coils P Q are employed they ma be separated from each other in any suitab e or convenient manner, as, for instance, by an insulating disk '1, interposed therebetween and slipped on to the coils N. The various coils N P Q and S may be coupled up in circuit in any desired relation, that is, in series or in parallel as may be desired for any particular demonstration or experiment.

It is evident that a laboratory apparatus such as above described is capable of a wide range of application by proper and simple arrangement of the various parts. For instance, and as indicated in Fig. 4, by assembling the magnet coils with their laminated cores in proper juxtaposition with respect tov each other and resting removably or being supported by the laminated base, and resting a rotary transformer frame, indicated at A, upon the upper ends of the laminated cores of the magnets, I am enabled to operate the transformer, employing the usual electrical connections, it being understood, of course, that current is supplied to the coils of the magnets. And similarly, by proper juxtaposition and arrangement of the magnets, the supporting laminated base and cross-bar, a great many other electrical phenomena may be demonstrated without the employ- Y ment of binding posts or thumb-nuts, and I requiring but small electrical power.

1 If desired, and in order to properly center the laminated magnet cores with respect to the laminated base and cross-bar, studs and sockets B C may be employed, as clearly indicated in the drawings, in the ends of the laminated cores for the magnets and in the surfaces of the base and cross-bar which contact with said cores.

From the foregoing description it will be seen that I provide an exceedingly simple, inexpensive apparatus, capable of building up strong magnetic fields or ofestablishing strong magnetic circuits, and capable of employment in the demonstration of various electrical and magnetic phenomena and for carrying out various tests, experiments and operations, and wherein the various parts are merely supported the one upon the other without any securing means, and which apparatus may be readily assembled or dismembered and reassembled in any suitable, convenient or desired relation.

Having now set forth the object and nature of my invention and various constructions embodying the principles thereof, what I claim as new and useful and of my own invention, and desire to secure by Letters Patent, is: g

In an electrical laboratory apparatus, the combination of a magnet mass, a coil surrounding the same, a plurality of additional coils surrounding the first said coil, and an insulating ring separating the last said coils from each other, all of said coils being independent of one another and the last said coils being detachable and removable from the first said coil.

In witness whereof, I have hereunto set my hand this 14th day of April 1905, in the presence of the subscribing witnesses.

CHESTER H. THORDARSON.

Witnesses:

E. C. SEMPLE, S. E. DARBY. 

